Hi Mike,
I'm pretty sure that what you have there is a BN2 - BN4 - BN6 box. The gears
in these boxes have the helix cut in the opposite direction from those in
the later boxes.
The easiest way to identify the gear set is to read the number stamped on
the laygear. Yours will probably be 1B3728.
As I recall the BN7 - BT7 box, where the helix angle was reversed, used an
AEC3359 laygear.
Even later boxes used AEC3471, AEC3616 AEC3649 and 22B141 laygears, in
chronological order.
Michael Salter
www.precisionsportscar.com
-----Original Message-----
From: owner-healeys@autox.team.net [mailto:owner-healeys@autox.team.net] On
Behalf Of M Lempert
Sent: Tuesday, May 09, 2006 9:54 AM
To: Healey List
Subject: Tranny identity crisis - follow-up
Hello folks. This is a follow up to my recent thread on the transmission
from my BN7. To refresh, it is a side shift from my BN7 but has a BN2 tag
on it. It will be mated to a BJ8 engine. There is some confusion as to
whether this is a BN2 box that was put in the car at some point, or a proper
box for the BN7 from the factory using a leftover BN2 casing. From the
earlier posting I have learned that some other listers have similar
situations where their MKI cars have the BN2 tranny label - some with a 7
stamped over the 2. The following link will show a bunch of pictures of the
gears and one of the bell housing. For those interested...
http://www.pbase.com/mdlempert/tranny
Regards,
Mike L.
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